More than 170 people were wounded in the explosions on Monday afternoon. The White House is calling them terrorist acts. So far, no one has been arrested.
On Tuesday, the names of two of the victims was released. Martin Richard, 8, of Dorchester, Mass., and Krystle Campbell, 29, of Medford, Mass.
Krystle Campbell was reportedly at the race to cheer on her boyfriend. Martin Richard was with his mother and sister at the finish line. Both family members remain hospitalized.
Boston University claims the third victim is a graduate student at its university, but no name has been released, at this time.